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stretch time, keeping pitch

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stretch time, keeping pitch

Subject: stretch time, keeping pitch
From: Michael Hanna <email@hidden>
Date: Tue, 30 Nov 2004 06:37:01 -0500

Hi, my app loads a sound via NSSound and manipulates it via Quicktime. I'd like to take a subregion of the sound/movie and play it back slowly, but keeping pitch like the original.

First of all, is it possible to get a 'subregion' or piece of the sound? I'd imagine that's a Quicktime call? From the light research I've done on this, does this sound have to have 1:1 frame/packet ratio(such as wav or aiff) in order to properly apply the dsp technique? Do I apply a FFT for this.. not sure where to start on this.

regards,
Michael

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